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authorDenys Vlasenko <vda.linux@googlemail.com>2017-01-09 13:55:11 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2017-01-09 14:02:55 +0100
commit3989e5adf454a3ab98412b249c2c9bd2a3175ae0 (patch)
tree8361ddd5dd5e4d35067ab4166f63aa482fece476 /Makefile.flags
parent8c1d857d2582c689681c7e6d3dc299613b4a7167 (diff)
downloadbusybox-3989e5adf454a3ab98412b249c2c9bd2a3175ae0.tar.gz
unlzma: fix erroneous "while" instead of "if". Closes 4682
These parts of the code essentially check whether stepping back by rep0 goes negative or not. LZMA SDK from lzma1604.7z has the following in the corresponding places: ... = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)] Clearly, not loop here. Technically, "while" here works: if condition is false (because pos underflowed), it iterates once, adds header.dict_size (a.k.a. dicBufSize), this makes pos positive but smaller than header.dict_size, and loop exits. Now we'll just check for negative result of subtraction, which is less code: function old new delta unpack_lzma_stream 2659 2641 -18 (I hope 2 Gbyte+ dictionaries won't be in use soon). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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